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Fig. 7B. —46-year-old woman with lymphoma. Axial contrast-enhanced CT scans of neck through thyroid gland shows oblique white line drawn on each side of neck through posterolateral margin of anterior scalene muscle (A) and posterior margin of sternocleidomastoid muscle (Sc). Levels IV and VB nodes are seen. No portion of clavicle is present on either side so supraclavicular nodes cannot be diagnosed.